David Ayer -- the guy who wrote "Training Day," "S.W.A.T." and a bunch of other action thrillers and also directed "Suicide Squad" -- wants out of his 14-year marriage.

Axar.az reports citing TMZ.

David filed for divorce Wednesday in L.A., citing irreconcilable differences. He married Mireya on September 26, 2002 and lists the date of separation as July 29.

There's a sign this one is amicable. David's lawyer, disco queen Laura Wasser, checked the box agreeing that her client would pay Mireya spousal support.

They have 4 minor children -- 14, 12, 11 and 8. David is asking for joint custody.

David -- who also wrote "The Fast and the Furious" and "End of Watch" -- will be writing a big check, because we've learned there was no prenup, and we're told he's made a bloody fortune.